https://spring.io/guides/gs/messaging-stomp-websocket/
<hr>
<button (click)="connect()">连接</button>
<button (click)="disconnect()">断开</button>
<div>
  <input type="text" #input>
  <button (click)="sendMsg()">发送</button>
</div>
<p>
{{message}}
</p>